from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Designed to be plugged in to an electric circuit: a plug-in game.
  • n. Computer Science See add-in.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Designed to be plugged into an electrical power outlet or circuit.
  • n. A computer program module or device that interacts with another to add a specific function, or to support a specific file format or device.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities


From the verb to plug in. (Wiktionary)



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